Three components kit for high performance green concrete

Abstract

A green concrete composition comprising: a binder component comprising Portland cement, natural basaltic volcanic ash pozzolan, and colloidal nano-sized silica particles; an aggregate component comprising fine aggregates and coarse aggregates; water; and a super plasticizer.

We claim: 
     
       1. A green concrete comprising:
 a binder component comprising Portland cement (C), natural basaltic volcanic ash pozzolan (VA), and colloidal nano-sized silica particles (CNS); 
 an aggregate component comprising fine aggregates (FA) and coarse aggregates (CA); 
 water (W); and 
 a super plasticizer; 
 
       wherein each 1 m 3  of green concrete comprises 533 kg of the binder component, 1732 kg of the aggregate component, 160 kg of the water, and 6.7-7.5 kg of the super plasticizer. 
     
     
       2. The green concrete of  claim 1 , wherein each 1 m 3  of green concrete comprises 373 kg of the Portland cement, 133 kg of the natural basaltic volcanic ash pozzolan, 27 kg of the colloidal nano-sized silica particles; 693 kg of the fine aggregates, 1039 kg of the coarse aggregates; 160 kg of the water, and 6.7 kg of the super plasticizer. 
     
     
       3. The green concrete of  claim 1 , wherein each 1 m 3  of green concrete comprises 320 kg of the Portland cement, 176 kg of the natural basaltic volcanic ash pozzolan, 37 kg of the colloidal nano-sized silica particles; 693 kg of the fine aggregates, 1039 kg of the coarse aggregates; 160 kg of the water, and 7.5 kg of the super plasticizer. 
     
     
       4. The green concrete of  claim 1 , wherein each 1 m 3  of green concrete comprises 267 kg of the Portland cement, 213 kg of the natural basaltic volcanic ash pozzolan, 53 kg of the colloidal nano-sized silica particles; 693 kg of the fine aggregates, 1039 kg of the coarse aggregates; 160 kg of the water, and 8.0 kg of the super plasticizer. 
     
     
       5. The green concrete of  claim 2 , wherein the green concrete has a compressive strength of about 70.0 MPa, about 87.4 MPa, about 104.6 MPa, and about 105.8 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively. 
     
     
       6. The green concrete of  claim 2 , wherein the green concrete has a rapid chloride penetration of about 278 Coulombs and about 96 Coulombs after aging for about 91 days and about 365 days, respectively, and a water absorption of about 2.38% and about 2.02% after aging for about 91 days and about 365 days, respectively. 
     
     
       7. The green concrete of  claim 2 , wherein the green concrete has an autogenous shrinkage of about 484 microns after curing for about 28 days. 
     
     
       8. The green concrete of  claim 2 , wherein the green concrete has a drying shrinkage of about 342 microns after curing for about 97 days. 
     
     
       9. The green concrete of  claim 3 , wherein the green concrete has a compressive strength of about 68.6 MPa, about 84.0 MPa, about 101.6 MPa, and about 100.9 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively. 
     
     
       10. The green concrete of  claim 3 , wherein the green concrete has a rapid chloride penetration of about 198 Coulombs and about 90 Coulombs after aging for about 91 days and about 365 days, respectively, and a water absorption of about 2.31% and about 1.92% after aging for about 91 days and about 365 days, respectively. 
     
     
       11. The green concrete of  claim 3 , wherein the green concrete has an autogenous shrinkage of about 606 microns after curing for about 28 days. 
     
     
       12. The green concrete of  claim 3 , wherein the green concrete has a drying shrinkage of about 384 microns after curing for about 97 days. 
     
     
       13. The green concrete of  claim 4 , wherein the green concrete has a compressive strength of about 59.3 MPa, about 75.4 MPa, about 90.8 MPa, and about 97.3 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively. 
     
     
       14. The green concrete of  claim 4 , wherein the green concrete has a rapid chloride penetration of about 287 Coulombs and about 64 Coulombs after aging for about 91 days and about 365 days, respectively, and a water absorption of about 2.50% and about 2.12% after aging for about 91 days and about 365 days, respectively. 
     
     
       15. The green concrete of  claim 4 , wherein the green concrete has an autogenous shrinkage of about 666 microns after curing for about 28 days and a drying shrinkage of about 413 microns after curing for about 97 days. 
     
     
       16. The green concrete of  claim 1 , wherein the fine aggregates comprise dune silica sand, the coarse aggregates comprise crushed limestone, and the super plasticizer comprise polycarboxylate ethers. 
     
     
       17. The green concrete of  claim 1 , wherein the colloidal nano-sized silica particles have a density of about 1.4 g/cm 3 , a pH of about 9.5, a viscosity of about 8 cP, about 50% by weight of silica, a diameter of about 35 nm to about 75 nm, and a specific surface area of about 80 m 2 /g. 
     
     
       18. The green concrete of  claim 1 , wherein the natural basaltic volcanic ash pozzolan and the colloidal nano-sized silica particles have a Chappelle activity (mg Ca (OH) 2 /g sample) of about 821.48 and about 1402.5, respectively. 
     
     
       19. The green concrete of  claim 1 , wherein the Portland cement and the natural basaltic volcanic ash pozzolan have a BET surface area of about 0.374 m 2 /g and about 0.356 m 2 /g, respectively.